Sound producer



Patented Sept. 9, 1924.

UNITED STATES l y 1,507,956 irrrENT` oFFIcE.

ALARD nuY sois-miraronD, nEcEAsED, LATE oF rLomNEAR'KIEL, GERMANrg'BY y ELEoNoRE'DU BoIs-nEYMo-ND,'AnM1N1sTRATnIX,OFHAMBURG, GERMANY, As-

SIGNOR T0 SIGNAL GESELLSCHAFT MANY.

MIT BESCHRANKTER HAFTUNG, O 'F KIEL, GER- soUND PRODUCERS.

Original application filed April 6, 1923, Serial. No. 630,421. Divided andthis application filed-April 15, 1924. Serial No. 706,792.

To all ywhom t may cof/1.061%.' l

Be it known that ALARD DU Bois-REY- MoND, deceased, late a citizen of the German Republic, residing at Plon, near Kiel, in the Province of ySchleswig-Holstein and State of Prussia., Germany, has invented certain new and useful Improvements in is a specification.

This invention relates to'sound producers or transmitters, and is a division of application Serial No.1630,421, filed April 6, 1923, Patent No. 1,493,340. The object of the invention is to provide an improved and practicable transmitter of the type operated or actuated by a unidirectional stream of A fluid (liquid or gas), and more particularly such a transmitter used for submarine signaling. i n

`The invention comprises the provision of a sound producer having a mechanical vibratory structure of a definite natural frequency interposed and operating be twee-n the fluid `discharge nozzle and the sound radiator. The stream of operating fluid is caused to impinge upon the vibratory structure and thus set it in vibration, and the vibrator-y sti'ucture in turnactuates the sound radiator. In the case of a submarine sound transmitter the vibratory structure is so arranged that a transformation of amplitudes of movements takes place between the point where the operating medium impinges on the vibratory structure and the point of connection of the said structure to the radiating member, so that at the last mentioned point the amplitude is smaller than at the first mentioned point. In the case of a transmitter to be used in air the amplitude transformation is in the reverse direction. Of course, more than one vibratory structure may be employed.

vIn the accompanying drawing I have shown by way of example a submarine sound transmitter embodying the invention.

Referring more specically to said drawing, the numeral 1 designates the casing of the transmitter, which is closed by the sound radiating diaphragm 2. A vibratory structure formed of the inelastic masses 3 and 4 connected by the elastic rod 5, is secured to the diaphragm 2 by having the mass 3 directly attached thereto. The conduit' or-tube 7 serves to conduct from any suitable source a iiuid under'pressure to the vibratory structure to set the latter inr vibration. This -fluid escapes from the mouth or-nozzle 6 ofthe conduit, impinges upon the mass y4, and flows .out of the cas-v ing 1 through the outlet ipipe 8.- Sound Producers,A of which the following rin a manner toybedescribed more in detail hereinafter. -This vibration is in turn imparted to the sound radiator 2 which in turn radiates the sound; into. the propagating` medium.

iment illustrated, by having the mass 3 of greater' magnitude than the mass 4. The mass 3jincludes 'a portion of the mass of the diaphragm together with aportion of the outside propagating medium which vibrates therewith.

The action of the operating fluid in exciting the vibratory' structure may be eX- plained in amore or less general way asfollows: As the fluid is discharged from thev nozzle 6 under pressure it impinges against the adjacent surface of the mass 4. The force of this discharge causes a movement of the massv 3 away from the nozzle and against the elastic force ofthe elastic member of the vibratory structure. As the mass 4 moves against such elasticv force the latter increases. .At the same time a decrease in the pressure of the operating fluid occurs as the space between the nozzle and the mass 4 increases and allows the more ready escape of the fluid. Thus a point is reached where the elastic forcev of the vibratory structure becomes great rela-tively to the pressure in the fluid to cause the mass 4 toymove back-toward the nozzle 6. As the mass app-roaches the nozzle the space between it and the nozzle As stated hereinbefore, when the invensufliciently is reduced and hence the pressure. in the iiuid increases. The inertia of the mass causes it to move beyond its position of resttoward thernozzle against the elastic Jforce of the elasticmember` and the fiui-d pressure.

periodicV iiioveiiiei'itl of the mass toward' and' away from the nozzle takes place, so that the vibratory structure is set in vibration. The-v f'requency of vibration is dependent among. other things uponf the individual or natural frequency of the vibrator'y structure, the' pressure of the operating fluid, thev form of discharge nozzle,and the space relation between'- t'lie nozzle and the mass of the vibratoify structure. Thefvibratory structure', it will be observed',acts in the nature of a mechanical interruptor of the fluid tloun y The conduit 7' may be made' of such size and shape adjacent the mouth or' nozzleV 6 ,as tof cause it to act as. a resonator and thus reinforce the vibrations.

I claim 1. In' a' sound transmitter, a' vibratory structure' of definitie. natural Jfrequency, a sound radiator directly attached to said structure,l and meansk for causing? a unidiu rectional streainlfof iuid to impinge on said yibratory structure to set it inl Vibration and thus actuatek said radiator.

,2. Iii` a sound transmitter, a vibi'atoi'y structure of definite naturaly frequency having points adapted toexecute" different ainplitudes oi movement, a sound' radiator directly attached toV said vibiatoiy structure at av point having a* certain amplitude of movement', and means for causinga unidireetional stream of fluidto-iinpingeon said vibratory structure at a point having a different amplitude of` lmovement to set' tlie `vibratoi'ystructure in Vibration and thus movement to set" the vibra-tory structure in Avibration and thus actuate said radiator.

4.111 a sound transmitter, avibratory struct-ure of definite natural frequency formed of two inelastic masses connected by a distinct elastic member, a sound radiator directly attached to one of said masses, and means tor' causing a unidirectional stream vof fluidto impinge on thev other mass to setl the vibrat'ory structure in vibration and `tlius actuate said radiator.

5. In a submarine sound transmitter, `a Vibratory structure of definite natural frequency formed of two inelastic masses of different sizes connected by a distinct elastic member, a sound radiator directly attached to the larger mass, and means for causing a: unidirectional stream of fluid to impinge onthe smaller mass to set the vibratory structure in vibratioii'and thus actuate said radiator.' Y

ELEONORE DU BOS-REYMND, A(Ziiiiitsraerim of Estilo/.teef A'Zerclvclio Bois- R-eymoad, deceased. 

